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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:32 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Theoretical Physics and Applied Mathematics
Title:
Markovian dynamics of quantum correlations in two-mode Gaussian open systems
Authors:
A. ISAR
Affiliation:
Department of Theoretical Physics, National Institute of Physics and Nuclear Engineering, Bucharest-Magurele
E-mail
isar@theory.nipne.ro
Keywords:
Quantum entanglement, quantum discord, open quantum systems, Gaussian states
Abstract:
In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we make a comparison of the behaviour of continuous variable quantum correlations (quantum entanglement, quantum discord, quantum steering) for a system consisting of : 1) two noninteracting; 2) two interacting bosonic modes embedded in a thermal environment. We solve the Kossakowski-Lindblad Markovian master equation for the time evolution of the considered system
and describe the quantum entanglement, discord and steering in terms of the covariance matrix for Gaussian input states. Depending on the values of the parameters characterizing the initial state of the system (squeezing parameter, average photon numbers), the coefficients describing the interaction of the system with the reservoir (temperature, dissipation constant), and of the strength of interaction between the two modes, one may notice such phenomena like generation of quantum correlations, their suppression (sudden death), or an asymptotic decay in time of quantum
correlations. We describe also the time evolution of the classical correlations and quantum mutual information, which measures the total correlations of the quantum system.
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